adding old solved challenges

StairCase/StairCase.java

@@ -0,0 +1,16 @@
+import java.util.Scanner;
+
+public class StairCase {
+  public static void main(String[] args) {
+
+    Scanner sc = new Scanner(System.in);
+    int n = sc.nextInt();
+    for (int i = n; i > 0; i--) {
+      for (int k = 1; k <= n; k++) {
+        System.out.print(k < i ? " " : "#");
+      }
+      System.out.println();
+    }
+    sc.close();
+  }
+}